<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <title>Document</title>
    <style>
        .one {
            width: 100px;
            height: 100px;
            background-color: yellow;
        }

        .two {
            width: 200px;
            height: 200px;
            background-color: hotpink;
        }

        .three {
            width: 250px;
            height: 250px;
            background-color: red;
        }
        .avtive{
            color: red;
        }
    </style>
</head>

<body>
   <div id="app">
    <div :class="['one','two','three']"></div>
    <!-- 
        强制绑定class的值也可以是一个数组,数组中的每一个值都会作为当前元素的类名
        强制绑定的class和普通的class是可以一起存在的
    -->
    <div class="public" :class="boxClass"></div>
   </div>

   <script>
    const vm  = new Vue({
        el:"#app",
        data(){
            return{
                boxClass:["one","two","three"]
            }
        }
    })
   </script>
</body>

</html>